hum [resolved]

[lesouthern]

Previously working amp, with an intermittent hum. I wiggle the left tube and it goes away.

I tightened some loose screws on the tube bases, trying to fix the issue. Now the hum is loud and constant, wiggling the tube does nothing. Amp is not usable.

I assume I have a bad solder in there somewhere? I've heard of it, but could you describe the chopstick trick you guys do to find bad connections?

 

[Thermioniclife]

It looks like alot of the solder joints are crusty looking. They need more heat until the solder flows.

 

[Paul Birkeland]

I would also turn your iron up to its hottest temperature.  Many of the solder joints I see haven't gotten hot enough to flow out properly, and if the flux can't flow out, the flux will actually linger between the two parts you want soldered, which makes a problematic joint.

 

[lesouthern]

Got it working, thanks for the help!